headphone amplifier circuit with TDA1308

headphone amp circuit

This circuit is primarily to provide common home stereo amplifiers with a microphone. The battery power is a good compromise is free in this manner the input circuit by the low hum pick area and connection to the amplifier is easier because of the lack of power cord and of diet.
Must be doubled with a stereo microphone the circuit. In this case, two separate level controls are better than one dual potentiometer stereo combined.
Low current drawing (about 2mA) ensures a battery.Circuit operation:
The circuit is based on a low noise, high gain two PNP and NPN transistor amplifier with negative feedback, stabilized by R6, working conditions very carefully.

The level is attenuated by P1, but at the same time, the stage victory lowered because of the increased value of R5. This unusual connection of P1, helps to achieve a high degree of input, so) to meet a wide range of input sources (0.2 to 200mV RMS for 1V RMS output.Notes:
THD is about 0.1% @ 1V RMS (all frequencies).
Maximum voltage input (cursor control level at a maximum) = 25 mV RMS
Maximum input voltage (level control cursor position in the center) = 200 mV RMS
Place the circuit in a metal case is highly recommended.
Simply the result of this device to the AUX input of the amplifier with shielded cables and connectors appropriate.